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Doubling and Halving Mental Maths Worksheet

Mental maths lesson 9: Doubling and halving · Set 426 · 40 questions
TalentJR

How to do it in your head (Split, then double or halve): To double: split into tens and ones, double both, add. To halve: split into an even number of tens and the rest (156 = 140 + 16). Halve both parts and add.

NameDateTime takenScore ___ / 40
  1. 1.Half of 104 =
  2. 2.Half of 138 =
  3. 3.Double 16 =
  4. 4.Half of 46 =
  5. 5.Double 95 =
  6. 6.Double 61 =
  7. 7.Half of 44 =
  8. 8.Half of 162 =
  9. 9.Double 84 =
  10. 10.Double 44 =
  11. 11.Double 45 =
  12. 12.Half of 96 =
  13. 13.Double 69 =
  14. 14.Half of 180 =
  15. 15.Double 68 =
  16. 16.Double 77 =
  17. 17.Double 73 =
  18. 18.Double 46 =
  19. 19.Half of 72 =
  20. 20.Double 83 =
  21. 21.Half of 66 =
  22. 22.Half of 50 =
  23. 23.Half of 36 =
  24. 24.Double 81 =
  25. 25.Double 71 =
  26. 26.Half of 156 =
  27. 27.Half of 140 =
  28. 28.Double 42 =
  29. 29.Double 72 =
  30. 30.Half of 102 =
  31. 31.Half of 164 =
  32. 32.Double 29 =
  33. 33.Double 91 =
  34. 34.Double 89 =
  35. 35.Half of 190 =
  36. 36.Double 24 =
  37. 37.Double 98 =
  38. 38.Double 66 =
  39. 39.Half of 28 =
  40. 40.Double 31 =

Answer key

  1. 52
  2. 69
  3. 32
  4. 23
  5. 190
  6. 122
  7. 22
  8. 81
  9. 168
  10. 88
  11. 90
  12. 48
  13. 138
  14. 90
  15. 136
  16. 154
  17. 146
  18. 92
  19. 36
  20. 166
  21. 33
  22. 25
  23. 18
  24. 162
  25. 142
  26. 78
  27. 70
  28. 84
  29. 144
  30. 51
  31. 82
  32. 58
  33. 182
  34. 178
  35. 95
  36. 48
  37. 196
  38. 132
  39. 14
  40. 62

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